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Table 1 The table below summarizes the description of indicators to evaluate the performance of an authentication approach

From: Authenticating GNSS civilian signals: a survey

Domain

Indicator

Description

Robustness

\(P_{D}\)

Detection probability

 

\(P_{{{\text{FA}}}}\)

Missing detection probability (fixed design parameter)

Security

\(L_{{{\text{ek}}}}\)

Effective key length

 

MPT

Maximum predictable time

 

USR

Unpredictable symbol rate

 

USW

Unpredictable symbol width

Efficiency

\(t_{{{\text{TTFAF}}}}\)

Time to the first authenticated fix*

 

\(t_{{{\text{TBA}}}}\)

Time between authentications

Cost

\(L_{{C/N_{0} }}\)

Equivalent loss in signal \(C/N_{0}\)

 

\(R_{s}\)

Server communication rate

 

\(R_{u}\)

User communication rate

 

\(N_{{\text{cal,s}}}\)

Satellite calculation complexity

 

\(N_{{\text{cal,r}}}\)

Receiver calculation complexity

 

\(N_{{\text{storage,s}}}\)

Satellite storage requirement

 

\(N_{{\text{storage,r}}}\)

Receiver storage requirement

  1. *\(t_{{{\text{TTFAF}}}}\) is modified to Time to the First Authenticated Channel (TTFAC) to indicate the time required to track the first authentic signal